Draft implementation of EIP-4399

cmd/evm/internal/t8ntool/execution.go

@@ -67,6 +67,7 @@ type ommer struct {
 type stEnv struct {
 	Coinbase         common.Address                      `json:"currentCoinbase"   gencodec:"required"`
 	Difficulty       *big.Int                            `json:"currentDifficulty"`
+	Random           *big.Int                            `json:"currentRandom"`
 	ParentDifficulty *big.Int                            `json:"parentDifficulty"`
 	GasLimit         uint64                              `json:"currentGasLimit"   gencodec:"required"`
 	Number           uint64                              `json:"currentNumber"     gencodec:"required"`
@@ -81,6 +82,7 @@ type stEnv struct {
 type stEnvMarshaling struct {
 	Coinbase         common.UnprefixedAddress
 	Difficulty       *math.HexOrDecimal256
+	Random           *math.HexOrDecimal256
 	ParentDifficulty *math.HexOrDecimal256
 	GasLimit         math.HexOrDecimal64
 	Number           math.HexOrDecimal64

cmd/geth/config.go

@@ -159,7 +159,7 @@ func makeFullNode(ctx *cli.Context) (*node.Node, ethapi.Backend) {
 		cfg.Eth.OverrideArrowGlacier = new(big.Int).SetUint64(ctx.GlobalUint64(utils.OverrideArrowGlacierFlag.Name))
 	}
 	if ctx.GlobalIsSet(utils.OverrideTerminalTotalDifficulty.Name) {
-		cfg.Eth.Genesis.Config.TerminalTotalDifficulty = new(big.Int).SetUint64(ctx.GlobalUint64(utils.OverrideTerminalTotalDifficulty.Name))
+		cfg.Eth.OverrideTerminalTotalDifficulty = new(big.Int).SetUint64(ctx.GlobalUint64(utils.OverrideTerminalTotalDifficulty.Name))
 	}
 	backend, _ := utils.RegisterEthService(stack, &cfg.Eth, ctx.GlobalBool(utils.CatalystFlag.Name))
 

consensus/beacon/consensus.go

@@ -181,10 +181,7 @@ func (beacon *Beacon) verifyHeader(chain consensus.ChainHeaderReader, header, pa
 	if len(header.Extra) > 32 {
 		return fmt.Errorf("extra-data longer than 32 bytes (%d)", len(header.Extra))
 	}
-	// Verify the seal parts. Ensure the mixhash, nonce and uncle hash are the expected value.
-	if header.MixDigest != (common.Hash{}) {
-		return errInvalidMixDigest
-	}
+	// Verify the seal parts. Ensure the nonce and uncle hash are the expected value.
 	if header.Nonce != beaconNonce {
 		return errInvalidNonce
 	}

core/blockchain_reader.go

@@ -343,6 +343,12 @@ func (bc *BlockChain) GetVMConfig() *vm.Config {
 	return &bc.vmConfig
 }
 
+// SetVMConfig sets the vm config.
+// Warning: might not be threadsafe with other components
+func (bc *BlockChain) SetVMConfig(config vm.Config) {
+	bc.vmConfig = config
+}
+
 // SetTxLookupLimit is responsible for updating the txlookup limit to the
 // original one stored in db if the new mismatches with the old one.
 func (bc *BlockChain) SetTxLookupLimit(limit uint64) {

core/evm.go

@@ -61,6 +61,7 @@ func NewEVMBlockContext(header *types.Header, chain ChainContext, author *common
 		Difficulty:  new(big.Int).Set(header.Difficulty),
 		BaseFee:     baseFee,
 		GasLimit:    header.GasLimit,
+		Random:      header.MixDigest,
 	}
 }
 

core/genesis.go

@@ -294,7 +294,8 @@ func (g *Genesis) ToBlock(db ethdb.Database) *types.Block {
 	if g.GasLimit == 0 {
 		head.GasLimit = params.GenesisGasLimit
 	}
-	if g.Difficulty == nil {
+	emptyHash := common.Hash{}
+	if g.Difficulty == nil && bytes.Equal(g.Mixhash[:], emptyHash[:]) {
 		head.Difficulty = params.GenesisDifficulty
 	}
 	if g.Config != nil && g.Config.IsLondon(common.Big0) {

core/state_transition.go

@@ -310,7 +310,7 @@ func (st *StateTransition) TransitionDb() (*ExecutionResult, error) {
 	}
 
 	// Set up the initial access list.
-	if rules := st.evm.ChainConfig().Rules(st.evm.Context.BlockNumber); rules.IsBerlin {
+	if rules := st.evm.ChainConfig().Rules(st.evm.Context.BlockNumber, st.evm.Config.RandomOpcode); rules.IsBerlin {
 		st.state.PrepareAccessList(msg.From(), msg.To(), vm.ActivePrecompiles(rules), msg.AccessList())
 	}
 	var (

core/vm/evm.go

@@ -75,6 +75,7 @@ type BlockContext struct {
 	Time        *big.Int       // Provides information for TIME
 	Difficulty  *big.Int       // Provides information for DIFFICULTY
 	BaseFee     *big.Int       // Provides information for BASEFEE
+	Random      common.Hash    // Provides information for RANDOM
 }
 
 // TxContext provides the EVM with information about a transaction.
@@ -131,7 +132,7 @@ func NewEVM(blockCtx BlockContext, txCtx TxContext, statedb StateDB, chainConfig
 		StateDB:     statedb,
 		Config:      config,
 		chainConfig: chainConfig,
-		chainRules:  chainConfig.Rules(blockCtx.BlockNumber),
+		chainRules:  chainConfig.Rules(blockCtx.BlockNumber, config.RandomOpcode),
 	}
 	evm.interpreter = NewEVMInterpreter(evm, config)
 	return evm

core/vm/instructions.go

@@ -475,6 +475,12 @@ func opDifficulty(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext)
 	return nil, nil
 }
 
+func opRandom(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext) ([]byte, error) {
+	v := new(uint256.Int).SetBytes((interpreter.evm.Context.Random.Bytes()))
+	scope.Stack.push(v)
+	return nil, nil
+}
+
 func opGasLimit(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext) ([]byte, error) {
 	scope.Stack.push(new(uint256.Int).SetUint64(interpreter.evm.Context.GasLimit))
 	return nil, nil

core/vm/instructions_test.go

@@ -21,6 +21,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
+	"math/big"
 	"testing"
 
 	"github.com/ethereum/go-ethereum/common"
@@ -650,3 +651,36 @@ func TestCreate2Addreses(t *testing.T) {
 		}
 	}
 }
+
+func TestRandom(t *testing.T) {
+	type testcase struct {
+		name   string
+		random common.Hash
+	}
+
+	for _, tt := range []testcase{
+		{name: "empty hash", random: common.Hash{}},
+		{name: "1", random: common.Hash{0}},
+		{name: "emptyCodeHash", random: emptyCodeHash},
+		{name: "hash(0x010203)", random: crypto.Keccak256Hash([]byte{0x01, 0x02, 0x03})},
+	} {
+		var (
+			env            = NewEVM(BlockContext{Random: tt.random}, TxContext{}, nil, params.TestChainConfig, Config{RandomOpcode: true})
+			stack          = newstack()
+			pc             = uint64(0)
+			evmInterpreter = env.interpreter
+		)
+		opRandom(&pc, evmInterpreter, &ScopeContext{nil, stack, nil})
+		if len(stack.data) != 1 {
+			t.Errorf("Expected one item on stack after %v, got %d: ", tt.name, len(stack.data))
+		}
+		actual := stack.pop()
+		expected, overflow := uint256.FromBig(new(big.Int).SetBytes(tt.random.Bytes()))
+		if overflow {
+			t.Errorf("Testcase %v: invalid overflow", tt.name)
+		}
+		if actual.Cmp(expected) != 0 {
+			t.Errorf("Testcase %v: expected  %x, got %x", tt.name, expected, actual)
+		}
+	}
+}

core/vm/interpreter.go

@@ -31,6 +31,7 @@ type Config struct {
 	Tracer                  EVMLogger // Opcode logger
 	NoRecursion             bool      // Disables call, callcode, delegate call and create
 	NoBaseFee               bool      // Forces the EIP-1559 baseFee to 0 (needed for 0 price calls)
+	RandomOpcode            bool      // Enables the random opcode
 	EnablePreimageRecording bool      // Enables recording of SHA3/keccak preimages
 
 	JumpTable JumpTable // EVM instruction table, automatically populated if unset
@@ -74,6 +75,8 @@ func NewEVMInterpreter(evm *EVM, cfg Config) *EVMInterpreter {
 	if cfg.JumpTable[STOP] == nil {
 		var jt JumpTable
 		switch {
+		case evm.chainRules.IsMerge:
+			jt = newMergeInstructionSet()
 		case evm.chainRules.IsLondon:
 			jt = londonInstructionSet
 		case evm.chainRules.IsBerlin:

core/vm/jump_table.go

@@ -58,11 +58,23 @@ var (
 	istanbulInstructionSet         = newIstanbulInstructionSet()
 	berlinInstructionSet           = newBerlinInstructionSet()
 	londonInstructionSet           = newLondonInstructionSet()
+	mergeInstructionSet            = newMergeInstructionSet()
 )
 
 // JumpTable contains the EVM opcodes supported at a given fork.
 type JumpTable [256]*operation
 
+func newMergeInstructionSet() JumpTable {
+	instructionSet := newLondonInstructionSet()
+	instructionSet[RANDOM] = &operation{
+		execute:     opRandom,
+		constantGas: GasQuickStep,
+		minStack:    minStack(0, 1),
+		maxStack:    maxStack(0, 1),
+	}
+	return instructionSet
+}
+
 // newLondonInstructionSet returns the frontier, homestead, byzantium,
 // contantinople, istanbul, petersburg, berlin and london instructions.
 func newLondonInstructionSet() JumpTable {

core/vm/opcodes.go

@@ -104,6 +104,7 @@ const (
 	CHAINID     OpCode = 0x46
 	SELFBALANCE OpCode = 0x47
 	BASEFEE     OpCode = 0x48
+	RANDOM      OpCode = 0x44 // Same as DIFFICULTY
 )
 
 // 0x50 range - 'storage' and execution.
@@ -279,7 +280,7 @@ var opCodeToString = map[OpCode]string{
 	COINBASE:    "COINBASE",
 	TIMESTAMP:   "TIMESTAMP",
 	NUMBER:      "NUMBER",
-	DIFFICULTY:  "DIFFICULTY",
+	DIFFICULTY:  "DIFFICULTY", // TODO (MariusVanDerWijden) rename to RANDOM post merge
 	GASLIMIT:    "GASLIMIT",
 	CHAINID:     "CHAINID",
 	SELFBALANCE: "SELFBALANCE",

core/vm/runtime/runtime.go

@@ -118,7 +118,7 @@ func Execute(code, input []byte, cfg *Config) ([]byte, *state.StateDB, error) {
 		vmenv   = NewEnv(cfg)
 		sender  = vm.AccountRef(cfg.Origin)
 	)
-	if rules := cfg.ChainConfig.Rules(vmenv.Context.BlockNumber); rules.IsBerlin {
+	if rules := cfg.ChainConfig.Rules(vmenv.Context.BlockNumber, false); rules.IsBerlin {
 		cfg.State.PrepareAccessList(cfg.Origin, &address, vm.ActivePrecompiles(rules), nil)
 	}
 	cfg.State.CreateAccount(address)
@@ -150,7 +150,7 @@ func Create(input []byte, cfg *Config) ([]byte, common.Address, uint64, error) {
 		vmenv  = NewEnv(cfg)
 		sender = vm.AccountRef(cfg.Origin)
 	)
-	if rules := cfg.ChainConfig.Rules(vmenv.Context.BlockNumber); rules.IsBerlin {
+	if rules := cfg.ChainConfig.Rules(vmenv.Context.BlockNumber, false); rules.IsBerlin {
 		cfg.State.PrepareAccessList(cfg.Origin, nil, vm.ActivePrecompiles(rules), nil)
 	}
 	// Call the code with the given configuration.
@@ -176,7 +176,7 @@ func Call(address common.Address, input []byte, cfg *Config) ([]byte, uint64, er
 	sender := cfg.State.GetOrNewStateObject(cfg.Origin)
 	statedb := cfg.State
 
-	if rules := cfg.ChainConfig.Rules(vmenv.Context.BlockNumber); rules.IsBerlin {
+	if rules := cfg.ChainConfig.Rules(vmenv.Context.BlockNumber, false); rules.IsBerlin {
 		statedb.PrepareAccessList(cfg.Origin, &address, vm.ActivePrecompiles(rules), nil)
 	}
 	// Call the code with the given configuration.